swimming problem

I brought my Arowana home yesterday. He was moving in the whole tank but today in the morning I switched on my tank led light and he got scared. After that I switched off the light and now he's swimming only at one side. My right side of 4ft tank has a power filter. Is he afraid of the flow...

So I don't have much time, or so I believe and I'm really freaking out. This has been going on for the whole day now. From since I woke up today I noticed my Dad's Silver Arowana threw up his meal from yesterday. I did a 30% water change yesterday. 55gal tank. Yes I know it was a lot but I've...

Hi guys, I'm freaking out right now. My first time in this forum My flowerhorn got hex because I saw some stringy white poop that is very long. He has not been eating and I wanted to give a 3% dose of epson salt with some food in it via 1 mL syringe. My flowerhorn is about 7 inches and this is...